Which retail technology innovation was first widely adopted by major bookstore chains in the late 1990s that significantly enhanced the in-store customer experience?

The book retail industry has undergone significant technological transformation in recent decades. From traditional bookstores to digital innovations, retailers have adapted to changing consumer behaviors while preserving the magical experience of literary discovery. This trivia question explores a key innovation that revolutionized the physical bookstore experience and helped brick-and-mortar locations compete against online giants.

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In-store digital kiosks allowing customers to search inventory and print book location maps
RFID-tagged books that could be located via smartphone apps
Augmented reality displays showing animated book covers when viewed through special glasses
AI-powered recommendation terminals that scanned customer faces to suggest personalized titles